But he isn't, and that's not going to change. Like, seriously. Even if they did want that to be a theory, you literally hear Killian pronounce "I am the Mandarin". Seriously getting tired of this argument.

Killian does literally say "I am the Mandarin" however that doesn't mean anything. I mean it could if you interpret it that way but I interpreted at a form of him gloating to Tony Stark that he fooled him and ultimately everyone. He was being cocky with that statement. At least in my eyes it came off that way.